Type of failure
|
Probable reasons
|
|
Belt rapture after short period of operation |
-
belt tearing during mounting on pulley
-
drive blockage with respect to failure of driven machine or foreign body entrapped inside the drive
-
poorly calculated drive with too small number of belts (poorly calculated coefficient of conditions of operation kT)
|
|
One-side usage of belt at its side wall |
-
too big not-parallelism of belt pulleys axis
|
|
Earlier usage of side surfaces at whole length of belts |
-
too big torque (mainly for drives with big start-up torque during driving machine start-up and big resistance torque during start-up of driven machine is necessary to use equipment ensuring soft start)
-
improper angle or excessive usage of groove of pulley
-
too small belt tension
-
too often short-term overloads of gearing with respect to failure of driving machine
-
too small number of belts
-
lack of parallelism of belt pulleys setting
-
minimal pulley diameter is exceeded
-
surface of grooves possess to big roughness
|
|
Local usage of side surfaces |
-
too small belt tension
-
blockage of driven machine pulley with respect to bearing failure
|
Grooves at side surface at whole belt length
|
-
belt friction because with contact with part of a machine
-
belt works in used-up groove of pulley
-
improper groove cross-section
|
|
Transversal belt breakage at the bottom side |
-
usage of external tension roller instead of internal
-
too small diameter of tension roller
-
excessive or too small temperature of operation
-
too big slippage
-
chemical influences
-
excessive belt tension
|
|
Indurations and ruptures of a wrap |
-
strong influence of dust
-
too big ambient temperature
-
influence of chemicals
|
|
Strong vibration |
-
base of axle bigger then is recommended
-
big shock load
-
too small belt tension
-
non balanced grooved pulleys
-
overloaded drive
-
angle of groove is not correct
|
|
Twisting of belts |
-
lack of coaxiality in pulleys setting
-
not correct belt or groove profile e
-
excessive vibration
-
too small belt tension
-
penetration of foreign material into grooves
-
overloaded drive
|
|
Falling of belts from pulleys after short period of operation |
-
too small belt tension
-
too small frequency of control and adjustment of belt tension
|
|
Too loud operation of gearing |
-
belt pulleys are not set coaxial
-
too small belt tension
-
overloaded drive
-
grooved pulleys not balanced
|
|
Uneven belts stretching |
-
faulty belts grooves
-
used belts do not create a set of belts
-
a few belts from a belt unit were replaced by new ones
-
unit of belts composed of from belts of different producers
-
bearings not lubricated
|
|
Excessive heating of bearings
|
-
grooved pulleys not balanced
|
|
Lowering of speed of driven pulley
|
-
check relationship between diameters of pulleys and their speeds
-
too small tension
|
PL
RO